Why is the 135F2L more expensive than the 851 8,501 4? Its aperture isn t as big as theirs, is it?

Because 135 is 50mm longer than 85, the longer the focal length of the lens (more than 100m), the greater the amount of light (above), the higher the requirements for the quality of the lens, especially the telephoto large aperture lens to achieve the imaging quality of the short-throw lens with the same aperture, the higher the requirements for the manufacturing materials and process of the lens. Therefore, 135m is more expensive. Similarly, 70-200mf is more expensive than 50mF.

The high technical requirements for a large aperture are compared with the same focal length, and for the 135 lens, 50 is the most mature and the lowest cost, so 50 is the cheapest in the family. If the technical requirements are high on both sides, the cost will rise.

1. Aperture = physical focal length Clear aperture, long focus large aperture must expand the clear aperture, which requires a lens with a larger refractive index, better structural design, and technically increased cost in materials.

2. Don't underestimate the value of a few tenths of a percentage, increasing the aperture needs to solve a series of problems such as phase contrast and chromatic dispersion, and it is necessary to balance the performance of the inside and outside of the focus, and it must withstand the critical gaze of professional users.

3. It is generally believed that 24 2 135 2 200 and so on are at the same level, ** at the level of 10,000 yuan. Something like 200 2 is much more expensive.

2 85 This is an entry-level prime with good imaging, but the details are not comparable to the previous level.

5. The expensive fixed focus consumer group is professional users and enthusiast players, and the output is not large, so there is no need to come down.

6. To evaluate a lens, the aperture focal length is the shallowest aspect, followed by sharpness, dispersion and other data obtained through evaluation, but the most important thing is the actual use effect. There are a lot of things that data can't tell.

Fixed focus is useful in its own way.

It is not certain to say who is better than whom.

If the requirements for a large aperture are not so high. That's better to go first85 Come on.

Since it's an exterior location, don't choose it, just the header.

It's 50 bar, the resolution and distortion of the fixed focus are incomparable with the zoom, and the fixed focus will be used to concentrate on shooting without thinking too much about the focal length problem, and the better ones can buy Sigma, which is calculated to be 75mm just to shoot people, and the depth of field of the large aperture is much shallower and the standard zoom head is still not comparable.

The picture quality of 50 is better than 85

However, it is inconvenient to use the fixed focal length head, so it is recommended to choose a factory zoom constant aperture lens, such as the Tamron 28-75

Both Canon and lens are portrait professional heads. The sharpness is up and down, and the imaging is very good, and there is not much difference.

The 85mm lens is lighter in color, and if you have to distinguish between high and low, 50mm is better.

Close-up, 50 aperture, clear nose, hazy eyes and ears.

Long shot, 50mm focal length, below aperture, background two-line is well distinguished, and the blur is very unnatural.

85 is completely different, because there is enough focal length, and the background blur effect is much more natural. It's also a little more atmospheric than the 50 in appearance.

In summary, although the 85 is a little lighter in color and is only suitable for outdoor shooting, the 85mm framing is a little more difficult indoors. But in terms of overall image quality, 85 is better for portraits.

Depending on what camera you have, if the APS-C model, for sure, 50 is equal to 80, and the aperture ratio is large.

at the same aperture; The imaging sharpness and color reproduction are definitely better than the other. That's for sure. What's more, the aperture is also a notch larger, which is definitely more practical in some conditions with insufficient light.

As for the difference in focal length, it can only mean that it is difficult to compare the situation you use.